Curved-line scriber.



T. MULLER. CURVED LINE SCRIBER. APPLICATION FILED SEPT. 6, i918.

1,299,606, Patented Apr. 1,1919.

ATES" PATENT OFFICE.

THEODOR MfiLLER, or ZURICH, SWITZERLAND, ASSIGNOR or ONE-HALF 'ro oscnn HAFELI, or ZURICH, SWITZERLAND.

CURVED-LINE SCRIBER.

Specification of Letters Patent.

Patented Apr. 1, 1919.

Application filed September 6, 1918. Serial No. 252,907.

To all whom it may concern vention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying. drawing, and to letters or figures of reference marked thereon, which form a part of this specification.

This invention relates to curvedline scribers or compasses comprising two guiderails and a bar which is provided with a holder for a pencil or the like, and which cooperates with two slide-blocks mounted in said guide-rails.

In known curved-line scribers of this kind, the guide rails are arranged at right angles and rigidly connected. Such compasses are only adapted for describing ellipses.

The invention consists in providing on a scriber or compass comprising in contradistinction to the scribers referred to a guiderail pivotally mounted on the other one, so that it can be adjusted to the right and left with regard to the middle position assumed by the guide-rails when they are set at right angles to each other, means for fixing automatically said pivotally mounted rail in the different positions into which it is brought. Such a scriber may be used, when the two rails are set at right angles to each other, for describing elliptical curves cutting determinate axes at right angles, while in an inclined position of the rails with regard to each other it may be used for describing curves which appear with regard to the same axes as lines curved to a greater degree and which may be regarded approximately as a compound line.

The invention also consists in the construc- This invention will now be more particularly described with reference to the accom panying drawing, which illustrates two constructlonal examples .of the invention.

In this drawing: Figure 1 is a front View of the first embodiment of the invention;

Fig. 2 is a cross-section on the line II-Il of Fig. 1;

Fig. 3 is a plan view corresponding to Fig. 1, partly in section;

Fig. 4 is a cross-section on the line IVIV of Fig. 3;

Fig. 5 shows on an enlarged scale a detail of Fig. 3;

Fig. 6 shows a front view of a part of the curved-line scriber used as beam-compass,

Fig. 7 is a corresponding bottom view of said part. I

Fig. 8 illustrates a detail on an enlarged scale, and

Fig. 9 shows parts of curved-lines described by means of the new compass.

Fig. 10 is an end view of a part of the second embodiment of the invention, and

Fig. 11 shows a horizontal section of said part.

l and 1 denote two guide-rails each provided with a longitudinal groove 2 and 2" respectively. 3 is a lower part arranged at right angles to the guide-rail 1 and rigidly connected to the latter. The lower part 3 acts as a support for the guide rail 1. The latter is provided at one end with a guide 4 fixed to the bottom of the groove 2 and projecting beyond said end, so that the guiderail 1 can be pivotally connected tothe guide-rail 1 by means of said guide 4; "'5 (Figs. 3 and 5) is the axis about which. the guide-rail 1 is adapted to pivot. 4' are two guide-ledges arranged in recesses of the sidewalls of the groove 2' and fixed to said walls (Figs. 3 and 5). The ends of the guideledges 4: extend into a recess of the guiderail 1, which recess-is so shaped, thatthe ends of the guide-ledges 4 come to rest in the two outermost positions of the adjustable guide-rails against the oblique lateral walls of said recess of the guide 1. The guide-ledges 4' provide in all positions of the guide-rail l for a smooth going over of the groove 2 into the groove 2. 6 denotes a line-scale provided on the lower part 3 for adjusting the guide-rail l in an exact manner. 7 denotes a bar having a slot 8. Two slide-pieces 9 and 10 mounted in the guidegrooves '2 and 2' respectively are adapted to be adjusted in said slot 8 and to be secured to the bar 7 in determinate positions by means of wing-nuts 11 and 12 respectively. 13 (Fig. 3) is a block movably mounted in the bar 7 and provided with a millimeter-scale.

To the block 13 is secured a holder 14 carrying'a pencil 15. 16 is a set-screw which is.

. said points cannot be inserted, as for instance on a glass-plate. In the latter case, a-suitablematerial preventing a sliding of the compass on the smooth base such as putty, may be'inserted into the spaces previously taken up by the pins 17 .or securing member provided with rounded 23v (F 3 and4) is a metallic stopping Qfi .n0tches 24. This member is fixed to the lower part 3 by means of screws 26 (Fig. The shape of the stopping member 23 is adapted to the arc described by the free end of-the guide-rail 1 when it is turned about the pivot 5. 27 denotes a hole provided in the 111111 1 near its end'below the guide groove 2. Within the hole 27 is movably mounted a pin 29 having a round- .edpfi head and acted, upon by a spring 28.

The recesses 24 of the stopping member 23 are arranged in. one line. Upon an ad ust men't Otthe guide-rail lflthe pin 29 comes to lie opposite a notch 24, it being then pressed into'the latter by the spring 28, thus securing the rail 1 inthe position into which it has been adjusted. The rounded off shape oftheh'eadof the pin 29 and of the'notches 24 provide for an; easy coming out of en gage nent of the pin 29 with said notches wheiia lateral pressure i's exerted upon the guide-rail 1. The three recesses 24 provided'on each side of the central notch 30,

which latter, corresponds to the position of the guide, rail 1" in which it is at right angles tothe rail 1, are arranged in a symmetric manner with regard to SZLlCl notch 30,

so that the. adjustments obtainedcorrespond to those obtained, by means of the markl in es 1', 2,3 of Fig. 3'.

of the'meinber 23 are for limiting the lateralmovement of the guiderail1.; I

"-VVhen it is'intendedflto describe with the compass 'hereinbefore described an ellipse cuteness right angles a coordinate system, the guide-rails 1,1, the directions of which determine said cohrdinatefsystem, are at first set at right angles with regard to each other; here'upon theslideie es 9 10 are adjusted injacc'or'dance with the major and minor axis of the ellipse to-be drawn, the compass being secured in the proper place on the surface on; which the ellipse has to be described by means of the points 17. Then all this has respectively.

The turned up ends been effected, a lateral pressure is exerted upon the end ofthe bar 7 carrying thepenoil-holder 14-, sothat the pencil 15 describes then one half of the ellipse 18 (Fig. 9), the slide-pieces9 and 10 being guided thereby in a positive manner in the grooves 2 and 2 The other analogous halfof the ellipse may 'be drawn as soon as the scriber has bee'nturned about an angle of 180. hen the guide-rail 1 has been moved into an inclined position, other elliptical curves may be drawn. 'By adjusting for instance, the rail 1" in such a) manner, that the pin 29 is caused to engage into the outermost left notch 24, in which case the right hand edge of the guide rail 1 coincides with the mark line 3 of the scale 6 provided on the lower part, the elliptical curve '19 (Fig. 9) may be drawn. The latter is curved to a greater degree than the curve 18 with regard to the same system of coordinates. This is, however, only approximately true, as the curve 19 does not pass exactly through the ends of the axes ofthe elliptical curve 18; but the differenceis so smalh-always assumed that the 'guiderail 1 isnot moved too much from its middle position-that this is of no practical importance. The curved line 19 may be regarded with sufiicient great approximation as one half (the left hand one) of a. compound curve. For the pur pose of describing the analogous second half, the guide-rail 1 is adjusted in such a manner, that the pin 29 is caused to engage into the outermost right notch 24, the left hand side edge of the rail 1 coinciding in this case with the other mark-line 3. In order to describe a closed curve, the compass has to be turned about an angle of 180 when one half of the curve has been described;

when this has been done, the other half can:

be drawn.

A part of the compass shown may also be used as beam-compass (Figs. 6 and 7);

To this end the bar 7 and the slide-pieces 9, 10 are removed from the guide-rails. Preferably' one of the slide-pieces is also removed from the bar 7 and to the slide-piece remaining on the bar 7 is secured a cap 21 provided with a fixing point 20 by means of a screW' threaded extension 22 (Fig. 8). Such a beam-compass can be used for drawing circles, the required adjustment being efl'ected by an adjustment of the bar 7 relatively tothe fixing point 20, or by an'adju'stment of the block 13 movably mounted in the bar 7.

In the second-embodiment of the inven-' tion shown in Figs. 10 and 11 the parts not shown correspond to the corresponding parts of the first construction.

The are shaped metallic stopping member 23 shown'in Figs..1'0 and 11' and fixed to the lower part 3 is provided with a series of holes 31 which are connected by means of slots 32. Each hole 31 is partly of cylindri-.

cal and partly of conical shape. The cylindrical part of each hole 31 is situated on that side of the member 23 which lies opposite the guide-rail 1. The pin 29 acted upon by a pressure-spring 28 is movably mounted within a sleeve inserted into the bore 27. The pin 29 has a conical part 34 and it comprises between said part 34 and a semispherical head 35 a cylindrical part 33 of smaller diameter. The diameter of the part 33 corresponds to that of the slots 32, while the diameter'of the head 35 corresponds to that of the holes 31.

The adjustment of the guide-rail 1 takes place in the following manner: A pressure is exerted upon the head 35 of the pin 29 until the conical part 34 comes out of engagement with the corresponding conical part of the hole 31, so that the part 33 of smaller diameter can then be pushed into the corresponding hole 32 and the rail 1 adjusted to the desired amount to the right or left respectively. As soon as the rail 1 has been set into the proper position, the head 35 is released. The spring 28 presses then the pin 29 outward, so that the conical part 34 is caused to engage the conical part of the hole 31. In consequence of this, the rail 1 is secured in the position into which it has been adjusted.

What I claim now as my invention is:

1. A curved-line scriber, comprising a guide-rail having a. guide-groove, a second guide-rail also provided with a guide-groove and pivotally connected in such a manner to said first mentioned guide-rail that it is adapted to be adjusted with regard to the middle position assumed by it when the two rails are set at right angles with regard to each other to the right 'or left respectively, two slide-pieces each of them being mounted in a guide-groove of one of said guide-rails, a bar provided with a slot, said slide-pieces being adapted to be adjusted in said slot, means for fixing the slide-pieces in the slot of said bar, means for securing a pencil on the bar and securing or stopping means carried partly by the pivotally mounted guiderail and partly by the other guide-rail for securing a proper adjustment of the pivotally mounted guide-rail as well in the position of the two rails in which they are set at right angles with regard to each other as in the position in which the pivotally mounted guide-rail is set into an inclined position with regard to the other guide-rail.

2. A curved-line scriber, comprising a guide-rail having a guide-groove, a member arranged at right angles to said rail ,and rigidly connected thereto and provided with a line-scale, a second guide-rail also provided with a guide-groove resting on said member and pivotally connected in such a manner to the first mentioned guide-rail that it is adapted to be adjusted with regard to the middle position assumed by it when the two rails are set at right angles with regard to each other to the right or left respectively, two slide-pieces each of them being mounted in a guide-groove of one of said guide-rails, a bar provided with a slot, said slide-pieces being adapted to be adjusted in said slot, means for fixing the slide-pieces in the slot of said bar, means for securing a pencil on the bar, a securing or stopping member fixed to said member supporting the pivotally mounted guide-rail and an adjustable member mounted in the last mentioned guide-rail securing in connection with said supporting member a proper adjustment of the pivotally mounted guide-rail as well in the position of the two rails in which they are set at right angles with regard to each other as in the position in which the pivotally mounted guide-rail is set into an inclined position with regard to the other guide-rail.

3. A curved-line scriber, comprising a guide-rail havin a guide-groove, a member arranged at right angles to said rail and rigidly connected thereto and provided with a line-scale, a second guide-rail also provided with a guide-groove resting on said member and pivotally connected in such a I manner to the first mentioned guide-rail that it is adapted to be adjusted with regard to the middle position assumed by it when the two rails are set at right angles with regard to each other to the right or left respectively, 'two slide-pieces, each of them being mounted in a guide-groove of one of said guide-rails, a bar provided with a slot, said slide-pieces being adapted to be adjusted'in said slot, means for fixing the slide-pieces in the slot of said bar, means for securing a pencil on the bar, a securing 0r stoppmg member fixed to said member supporting the pivotally mounted guide-rail and compris ing a part shaped in accordance with the arc described by the free end of the adjustable guide-rail when the latter is adjusted and having a series of holes connected by slots, a pin movaibly mounted in the free end of the pivotally mounted guide-rail, said pin being provided at the end of the guide-rail with a thin portion corresponding to the width of the slot and a thick portion adapted to fit into said holes and a spring also mounted in the free end of the pivotally I Whichthe pivotally mounted guide-rail isit I ecame.-

guide-rail is adapted to be adjusted with regard to the middle position assumed by it when the two rails are set at right angles with regard to each to the right or left respectively, two guide ledges mounted in recesses provided in the lateral walls oi the guide-groove of the pivotally mounted guide-rail and fixed to said walls, the ends of said ledges extending into a recess of the first mentioned guide-rail and being thus adapted to provide in all positions of the adjustable guide-rail for a smooth going.

over of the guide-groove of the latter into the guide-groove of the first mentioned guide-rail, two slide-pieces, each ofthem being mounted in a guide-groove of one-of said guide-rails, a bar provided with a slot; said slide-pieces being adapted to be adjustset into-an inclined position with regard to the otherguide-rail.

5. A curved-line scriber, comprising a guide-rail having a guide-groove, sleeves 1nserted 1 n to the lower part of said rail, fixing points removably screwed into said sleeves.

and arranged in the middle line 0t thejrail on the bottom side of they latter, a second guide-rail also provided with a guide-groove and pivotally connected in such a manner to said first mentioned guideerail that. it is adapted to" be adjusted with regard to the middle position assumedby. it when the two rails are set at right angles with regard to each other to the right or left respectivelytwo slide-pieces each of them'being-mounted in a guide-groove of one of said guide-rails,v a bar provided with a'slot, sald slide-pieces.

being adapted to flee-adjusted in said slot, means for fixing the sliderpieces-in the slot of said bar, means for securing a pencil on the bar and securing or stopping means car'- ried partly by the pivotally' mounted guiderail for securing a proper adjustment-59f the: pivotallymounted guiderrail as well ml the' position of the two'rails in which they arev set at right anglesw-ithregard'toeach other asin the position in; which the pivotally mounted guide-rail is-set into an inclined position with regard toitheo'then'guide-rail.

In testimony that I claim the foregoing as my invention, I have signed my, name,.

rnnonon MiiLLER;

copiesi'oi this patent may be'obtained tor five cents each, by addressing; the Commissioner otl'atents, Washington, D. G." I 

